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a
b
c
d
e
f
Fig. 4.2.
Responses of two-shoot peas to overall and to localized stress conditions.
a
Both
shoots developed in most control plants in optimal conditions.
b
Removing a large part of
the cotyledons, and hence of the reserve materials, increased shoot inequality.
c
Growing
plants in vermiculite without nutrient solutions (
NS
) increased shoot inequality.
d
Shading
both shoots, which presumably limited photosynthesis, is a third example of the general
increase of shoot inequality in response to stress.
e
,
f
Restricting the light reaching only one
of two young shoots greatly limited its development. When a shoot was darkened (
f
)rather
then shaded (
e
) it died in 80% of the plants. The
numbers
refer to the dry weights of the
shoots in milligrams. (They are not comparable to the fresh weights in Fig. 4.1.); (Based on
Sachs and Novoplansky 1997 and Novoplansky et al. 1989)
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